This is the bios chip on ASUS ROG STRIX B450-F GAMING mainboard.

This should be the data sheet of this family of SPI flash chips.
https://www.gigadevice.com/flash-memory/gd25lb128d/

I tried to connect it to a raspberry pi-4 with SOIC test clip and 1,8v power supply and logic-level converter,
but flashrom v0.9.9-r1954 on Linux 4.19.105-v8-28 (aarch64)
only found:
flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=1000
"...
Found Generic flash chip "unknown SPI chip (RDID)" (0 kB, SPI) on linux_spi.
Probing for Generic unknown SPI chip (REMS), 0 kB: REMS returned 0xc0 0x01. probe_spi_rems: id1 0xc0, id2 0x1
Found Generic flash chip "unknown SPI chip (RDID)" (0 kB, SPI).
===
This flash part has status NOT WORKING for operations: PROBE READ ERASE WRITE
..."

I saw in newest version https://github.com/flashrom/flashrom/blob/master/flashchips.h
this chip is still not listed. So probably also not supported in newest development version.


regards
s.priehse